2 Answers
2

DVWA separates each vulnerability into its own page. Each page is accessible on the menu to the left. Each vulnerability is a textbook example of the flaw, there should be nothing strange going on so any documentation on that vulnerability is useful. If you don't understand the very basics of a flaw, then I'm sure OWASP has a page on it. You could also try and find an exploit for the specific flaw "in the wild" (like exploit-db.com).